When you ascend, you can click ascend multiple times (until you close it) then you have to rebirth more to ascend again. don't think this is the intend? <3
Hmm even in the best circumstances(2 speedups and no crashes) I can't get further than halfway. I guess it is cuz the timer isn't connected with the game performance.
I don't mind simple graphics, I love playing old games.
The money is out of balance, you are getting too little for the costs of the new towers, at lvl 49 you get 80$ you can't buy 1000$ upgrades for it.
But the money fits the waves tho, altho maybe even a bit too easy. You have to fit them all together too make an exciting tower defense game.
It's also quite slow-paced. Which gets rather dull after a while.